Heater for incubators.



G. F. ARMSTRONG.

HEATER FOB INGUBATOBS.

APPLICATION nun M347, 1914.

1,130,052. Patented Mar. 2, 1915.

UNITED STATES PATENT OFFICE.

GEORGE E. ARMSTRONG, OF HAMILTON, ONTARIO, CANADA.

HEATER FOR INCUIBATORS.

Application filed February 27, 1914.

To all whom it may concern Be it known that I, Grouse FRANCIS ARM- STRONG, a subject of the King of Great Britain, and a citizen of the Dominion of Canada, residing at 218 Aberdeen avenue, in the city of Hamilton, county of lVentworth, Province of Ontario, Dominion of Canada, have invented certain new and useful Improvements in Heaters for Incubators, of which the following is aspecification.

This invention relates to heaters for incubators and it has more particular reference to a device which is intended to serve as a substitute for the ordinary coal-oil heater and the like.

The object of my invention is to provide a neat and compact heater which can be readily placed in position and at the same time is absolutely controllable in so far as the degree of temperature is concerned.

With these objects in view mv invention consists in the novel features of construction, arrangement and combinations of parts as hereinafter fully described and more particularly pointed out by the appended claims.

The accompanying sheet of drawings is in illustration of one practical embodiment of my invention. Figured, being an elevation of a heater constructed in accordance with my improvements. Fig. 2, is a top plan of the same.

According to the form of my invention illustrated 1. is a rectangular or other suitably shaped base of insulating material suitably mounted on feet or the like 2. 2.

3. 3. are rods or uprights suitably incased in insulating material and provided with spacing or lock-nuts 4, 4e.

5. is an upper or cover plate of sheet steel or the like which is supported on the aforesaid rods 3, 3, as shown and it is provided with. a central opening or aperture 6, for the egress of the warm air from the heater to the incubator chamber.

7, 8. 9, 10, and 11, are binding screws passing through the base 1, and being adapted to have coupled thereto conducting wires. 12, 13, 14-, 15, and 16. connecting with the heating coils as hereafter explained.

Specification of Letters Patent.

Patented Mar. 2, 1915.

Serial No. 821,421.

17 17 are the terminal screws or posts for the source of power such as an ordinary electric light cable connection.

19, 20, 21, 22, and 23, are ordinary switches for coupling up any one of the heating coils 24, 25, 26, 27, and 28. These heating coils 24, 25, 26, 27 and 28, comprise sheets of mica adapted to fit neatly and be clamped in the spaces between the rods or uprights 3, 3, and plates 1, and 5; and they are wound with resistance wire. The wire used may be of finer gage in some cases thereby giving different degrees of heat. The lower ends of the resistance wires 29, are connected to the binding screws 7 8, 9, 10, and 11, and the upper ends thereof are suitably united to the top plate 5, in any of the well known ways. There are altogether in the form of my invention shownfive heating coils, two 25, 26, on one side of the heater, and one on each of the other three sides.

29 designates a binding band of insulating material which aids in keeping the parts in place. The sheets of mica 30, with their windings 24, 25. 26. 27 and 28 are held in place by being bound between plate 5 and base 1, when nuts 4 are tightened. it being understood that the heating elements so formed constitute the sides of a hollow square.

The operation of the invention will be self evident to those skilled in the art to which it appertains and I wish it clearly understood that I do not restrict myself to the precise details above outlined but deem myself privileged to make such reasonable modificat ons as may fairly be construed as falling within the ambit of the appended claims.

Having thus described my invention what I cla m as new and desire to secure by Letters Patent. is

1. In a device of the character described, a heater for incubators comprising an insulating base plate, a cap plate and a plurality of sheets of mica wound with resistance wire and bound between said base plate and said cap plate to form a hollow square.

2. In a device of the character described, a heater for incubators comprising an insulating base plate, a cap plate, and a plurality Signed at Hamilton, county of Wentof sheets of mica wound with resistance Wire Worth, Province of Ontario, Canada, this and bound between said base plate and said 9th day of February, A. D. 1914:.

cap plate to form a hollow square, there be- G. F. ARMSTRONG.

' ing five of said sheets of mica, one arranged In the presence of upon each of three sides of the square and ALFRED T. BRATTON, two upon the remaining side. GERTIE NICHOLSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

